Shock absorber



Sept. 15,v 1931. l H, LUDW|G A1,823,835

SHOCK ABSORBEH Filed Sept. 19. 1928 /NVEN/ dl? Lgf. W

Patented Sept. 15, 1931 Urso STATES HANs Lunwre; or HoMBURGvoR DER HoHE,

v PATENT l OFFICE GERMANY, ASSIGNOR or ONE-HALF ro rRANKroaT-oN-THE-Marn, GERMANY..

v snoek insonni-sr.

Application filed September A19, 1928, Serial No. 307,003, and in Germany October 29, 1927.

This invention relatesto a shock absorber, more particularly for automobile vehicles, in which the damping action :isbrought about in a known manner by fa vbrake band,

which is pulled frictionally lover asurface.

The advantages of the present-invention, as compared with known devices of a similar type, consist in the factthat this surface is resilient, as a result of which the damping acts smoothly, and that furthermore, by suitable fastening and 4,adjusting devices,

the degree of damping `can be accurately` regulated.

The invention is illustrated by way of eX- ample in the accompanying drawings, where- 111 y:

Fig. 1 is a frontrelevation of a' shock ab'- sorber, with the cover removed; v v

Fig. 2 is a cross section onl the line YA--A in Fig. 1; ,i

Fig. 3 Yis a back view of the shock absorber showing the adj'ustingdevice; f v Y Fig. 4 shows the shock absorber with a second constructional form ofl the brake spring, i

F ig. 5 is a back view of the shock absorber with a modified constructional form of the adjusting device, and

Fig. 6 shows a ythird Vconstructional form of they brake spring. j l

In the shock absorber illustrated, certain known details are provided. These consist in a base plate 1, upon which is rotatablyy mounted a drum 2, which is subject tothe influence of a plate spring 3. To the drum 2 is secured the innerV end of a bra-ke band .4, which passes twice round the drum and then over a lever to the a-Xleof the vehicle.

The present invention consists in substituting for the brake lever a resiliently acting braking member, and further vconsists in an adjusting and clamping device associatedtherewith. A

Above the drum 2 is fitted a flange 8 `which is rigidly connected with the base plate 1 and which serves at the same time as a hub fora fastening bolt 9. .Overthe flange 8 is drawn a spring 5, which consists of strip steel o1I of hard brass, and which is formed at its right-hand free end into a loop 7, and

. Fig. 3. On one side head, .this screw ybeing ing plate 11.` The latter serves at the'sa-lne time as a'two-sided stop for a bolt 12 mount ed on the drum 2, `and limits the movement thereof in bothl directions.

."The'adjusting and altering of the damping action is effected as indicated in Fig. 3

by rotating the entire shock absorber about -the fastening bolt 9, whichy is first somewhat slackened, and even small rotations already show considerable alterations in the damping action. Ont-hisfground a devicefor fine ad justment is necessary,

` andthisis provided on the back ofthebase plate 1, 4as shown-in of the straight line B passing through the fastening bolt 9 and the centrev ofthe shock absorber is provided a xed abutment 13. On the other side of the said line is located the adjusting device, consisting of` a screw 14 with a.v hemispherical l displaceable in a projection 15 on thebase plate 1, and admitting of being locked to the said projection by means of a lock'nut 16. The screw 14 may also be used with the end of the bolt for adjusting purposes, in which ycase the lock nut comes on the other side ofthe projectiony 15.

The shock absorber acts in suchV a manner that fin the case of shocks to the road wheel of the vehicle a'loosening of the brake band 4' takes place, which however is immediately compensatedfor by thel spring 3. Upon the carriage spring refacting the brakeband 4 is pulledtight over the braking spring 5,

ywhich v'nmreover presses with theloop 7 against the inner turnV of the brake band v4, as a result of which yresilient friction is produced atboth points, andthe oscillations of the'carriage spring are damped. The fixed flange Slunder these circumstances prevents the brake band 4 from bending at an angle. The adjusting of the'shock absorber Vis efjfected when necessary according to the reof the brake band and means for holding -one l vcned bolt 9 by rotating pas sult observed, by rocking A'the entire shock absorber to a suitable extent about the loosthe screw 14.

The second constructional Jform of the braking spring, shown in Fig. 4, comprises `a steel band 17, which is bent at both ends into loops 18, and mounted by them upontwo pins 19 secured in the base plate 1. The diameter of the spring loops the thickness of the pins, iii 'order that Vthe brake band 4 may not subject the pins 19 to a bending stress.' Such abrake spring, be,- sides simplifying manufacture, causes a con! siderable reduction in the size of the shock absorber, and facilitates the litting thereof'to the vehicle. rlhe method of working of the brake spring 17 is distinctive, inasmuchas when detlecting it bears upon the ends of theA loops 18, their resistance thus being reinforced.

This circumstance lbecomes still more obvious in a further constructional form of the brake spring, which is shown in Fig. 6. Here the spring 17 is held fast to the base vplate 1 merely by a single pin v19, round which the loop 18 is passed so far that no longitudinal displacement can occur.Y In this form the `ends of the spring lie directly on the under .surface of the spring 17 and` thereby yield the effect of a laminated spring. Y

A second constructional Jorm of the ad justing device consists, as shown in Fig. 5, in arranging upon the back of the shockwabsorber, obliquely tothe rectilinear aXis'B', a broad guiding groove 20, in which an adjusting angle bar 21 is slidable for ycoarse `adjustment. This coarse adjustment must lbe effected ybefore fitting theshockabsorber to the vehicle frame' and for this purpose there Vis provided in the angle bar 21 .a slot 22 iter the fastening bolt 9 and a second slot 23 with conical notches ,for kthe head of Aa locking screw y24, wherebyv any Vtendency to shake loose automatically owing to vibration of the vehicle isprevented. Intlie flange 25 of the angle bar 21, which is bent atright angles, is adjustably arranged a screw 26, which .servesfor the tine adjustment of the .shock absorber.

V The guiding groove 2O may coincide with :the rectilinear aXis B instead t 0r Y 0 bem@ Ob Vautomobile vehicles, comprising a base plate,

lique thereto, and the bent-upv flange 25 Vof the angle bar21 is then joggled sideways, in

order to give the screw 26 the requisite lev-Y erage in relation to the .rectilinear aXis B.

wWhat I claim is-:- Y Y 1. A shock absorber., more particularly for automobile vehicles., compri singV a base plate, a drum rotatably mounted von the base plate, a drum .spring tending to rotate the drum in 'one direction, a .brake Vband passingl twice round the drum and tending to rotate the Y druni in the opposite direction, a brake spring interposed between .the inner and outer turns 18 isA greater than *onek direction, la brake band passing twice round the' drum and tending Yto rotate it in the opposite direction, al brake spring interposed 'between' the inner and outer turns of the brake band, and means for holding one end of the brake spring in position on the base plate, tliefiee rend of the brake spring being bent into a4 Yloop which. bears against the inner vturn of the -brake band.`

f3. A shock absorber, more particularly for automobile vehicles, comprising a base plate, a iange rigidly connected with the base plate, a 'drum rotatably mounted on the base plate, a drinn spring tending -to rotate the druml in one direction, a brake band passing twice round the drum and tending to rotate it in the opposite direction,tlieinner turn of the brake band passing inside the flange and the outer turn passing outside the flange, and a brake spring interposedbetween the inner and outer turns of the brdre band,=said brak-e'spring being secured at one end to tlie iange and be# ing Vleent at the free end into a loop which bears against the inner-turn of the brake band.l

4. A shock absorber, more particularly for Vautomobile vehicles, comprising a base plate,

, two pins projecting from the face of the ybas/e plate, plate,

drum in one twice round the ldrum and tending to rotate it in the opposite direction, the inner turn of a drumrotatably mounted onthe'rbase ythe brake band passing inside the twopins two pins proj ectingfrom' the face of the base plate,a drum rotatably mounted on the base plate, a. drum spring tending to rotate the vdru'inin ,one direct-ion, a brake band passing twice round the drum and tending tov rotate Vit in the opposite direction, the inner turn of V,on the two pins, with theends of the brake a drum spring tending to vrotate the direction, a brake band passing a fastening bolt arranged in the neighbourhood of the upper edge of the base plate, ay

drum rotatably mounted on thebase plate, a drum spring influencing. the drum, a brake band passing twice round the drum, a brake Y spring interposed between the inner and outer turns of the brake band and means on said base plate for rotating the entire shock absorber about the fastening bolt, for the purpose set forth.

7. A shock absorber, more particularly for automobile vehicles, comprising a base plate, a fastening bolt arranged in the neighbourhood of the upper edge of the base plate, an axle bolt secured to the base plate, a drum r0- tatably mounted on the axle bolt, a stiening plate connecting the axle bolt with the fastening bolt, a drum spring influencing the drum, a brake band passing twice around the drum, and a brake spring interposed between the inner and outer turns of the brake band.

8. A shock absorber, more particularly for automobile vehicles, comprising a base plate, a fastening bolt arranged in the neighbourhood of the edge of the base plate, an axle bolt secured tothe base plate, a drum rotatably mounted on the axle bolt, a drum spring influencing the drum, a bra-ke band passing twice round the drum, a brake spring interposed between the inner and outer turns of the brake band, a fixed abutment secured to the back of the base plate to one side of a straight line passing through the centres of the fastening bolt and of the shock absorber, an adjusting screw mounted on the back of the base plate on the other side ofthe said straight line, and a lock nut co-operating with the adjusting screw.

9. A shock absorber, more particularly for automobile vehicles, comprising a base plate, a fastening bolt arranged in the neighbourhood of the edge of the base plate, an axle bolt secured to the base plate, a drum rotatably mounted on the axle bolt, a drum spring influencing the drum, a brake band passing twice round the drum, a brake spring interposed, between the inner and outer turns of the brake band, a guide on the back of the the angle bar being formed with a slot adaptf ed to fit over the' fastening bolt and with a second slot, a locking screw adapted to pass through said second slot, and a screw for fine adjustment passing through the flange of the angle bar.

10. A shock absorber, more particularly for automobile Vehicles, comprising a base `plate, a fastening bolt arranged in the neighourhood of the edge of the base plate, an axle bolt secured to the base plate, a drum an angle bar adapted to slide in the guide for coarse adjustment, the web of the angle bar being formed with a slot adapted to bit over the fastening bolt' and with a second slot,

a locking screw adapted to pass through said second slot, and a screw for fine adjustment passing through the flange of the angle bar.

In testimony whereof I have signed my name to this specification.

HANS LUDWIG. 

